Fan volute with adjustable molded line and fan for testing

Abstract

The utility model relates to a molded line adjustable fan volute and a fan for testing, which can improve the performance of the fan and remarkably reduce the iteration time of design and the manufacturing cost. The fan volute with the adjustable molded line comprises a volute frame, the volute frame comprises a pair of end covers arranged at intervals, and each end cover is provided with an air inlet and a plurality of arc-shaped grooves formed around the air inlet; the volute annular wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; each adjusting assembly comprises an adjusting rod and fixed cover plates, wherein the adjusting rod is slidably inserted into the opposite circular-arc-shaped grooves in the two end covers and abuts against the elastic side walls, and the fixed cover plates are connected with the two ends of the adjusting rod and located on the outer sides of the two end covers correspondingly. The fixed cover plate extends outwards from the adjusting rod so as to cover the arc-shaped groove all the time when the adjusting rod is adjusted along the arc-shaped groove.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a fan volute with adjustable profile and a testing fan. Background Art

[0002] In the development and design process of range hoods, experimental testing of centrifugal fans plays a vital role, because this kind of testing of centrifugal fans can not only ensure that the fan performance meets specific requirements, but also help optimize the design, improve energy efficiency and reduce noise. Finally, through precise testing, engineers can verify and improve the design, thereby producing a more efficient and user-friendly range hood.

[0003] However, in the traditional centrifugal fan testing process, the design and manufacture of the volute structure faces a significant challenge. Specifically, whenever the test data reveals design deficiencies and a new design solution needs to be tried, engineers must process a brand new volute, which not only leads to a long waiting time for proofing, but also significantly increases the length of the test cycle, which in turn affects the product's time to market and significantly increases the development cost of the centrifugal fan. Especially in today's increasingly competitive market, such delays and cost increases may have a serious negative impact on the company's market position. Utility Model Content

[0004] Based on this, it is necessary to address the problems of long testing cycle and high development cost of the volute structure. The utility model provides a fan volute with adjustable profile and a test fan, which can improve the fan performance and significantly reduce the design iteration time and manufacturing cost.

[0005] In one embodiment of the present application, the utility model provides a fan volute with adjustable profile, comprising:

[0006] The volute frame comprises a pair of end covers arranged at intervals, each of the end covers having an air inlet and a plurality of arc-shaped grooves arranged at intervals around the air inlet;

[0007] The volute ring wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; one end of the elastic side wall is fixedly connected to the two end covers to form an air outlet with the volute tongue; the other end of the elastic side wall is rolled up inside the volute tongue to form a reel; and

[0008] Multiple adjustment components, each of which includes an adjustment rod that is slidably inserted into the arc-shaped grooves opposite to each other on the two end covers and abuts against the outer wall surface of the elastic side wall, and a fixed cover plate that is connected to both ends of the adjustment rod and is respectively located on the outside of the two end covers; the fixed cover plate extends outward from the adjustment rod to always cover the arc-shaped groove when the adjustment rod is adjusted along the arc-shaped groove.

[0009] According to one embodiment of the present application, the central angle of the arc-shaped groove is equal to 180° to form a semi-circular arc groove.

[0010] According to an embodiment of the present application, both ends of the semicircular arc groove are arranged on the end cover along the radial direction of the air inlet.

[0011] According to one embodiment of the present application, the fixed cover plate is an annular fixing plate matching the circular arc groove.

[0012] According to an embodiment of the present application, the adjusting rod is fixedly connected to the annular fixing plate, and the adjusting rod is eccentrically arranged relative to the annular fixing plate.

[0013] According to one embodiment of the present application, the end cover further has a convex shaft coaxially arranged with the arc-shaped groove, and the annular fixing plate is rotatably mounted on the convex shaft.

[0014] According to an embodiment of the present application, the profile-adjustable fan volute further includes a position mark provided on the annular fixing plate and corresponding to the adjusting rod, and an angle mark provided on the convex shaft and corresponding to the arc-shaped groove.

[0015] According to one embodiment of the present application, the profile-adjustable fan volute further includes a pair of sealing gaskets respectively located between the two end covers and the volute annular wall, each of the sealing gaskets having an adjustment hole corresponding one to the circular arc groove; the sealing gasket includes a flexible pad body protruding from the inner wall surface of the end cover and extending along the elastic side wall, and a flexible flange extending along the edge of the adjustment hole and extending from the flexible pad body into the circular arc groove.

[0016] According to an embodiment of the present application, the adjustment assembly further includes a buffer pad that is sleeved on the adjustment rod and fits with the elastic side wall, and a magnetic member that is sleeved between the adjustment rod and the buffer pad and magnetically attracts the elastic side wall.

[0017] According to another aspect of the present application, according to an embodiment of the present application, a test fan is further provided, comprising:

[0018] Wind rack;

[0019] Any of the above-mentioned adjustable profile fan volutes, wherein the adjustable profile fan volute is arranged in the fan frame; and

[0020] An impeller is rotatably arranged on the profile-adjustable fan volute.

[0021] To summarize, the profile-adjustable fan volute of the present application, on the one hand, takes into account the adjustable range of the volute profile and the available space of the fan frame by providing an arc-shaped groove on the end cover, so as to improve the space utilization rate of the fan frame of the profile-adjustable fan volute while ensuring that the adjustment distance / range remains unchanged; on the other hand, the annular fixing plate matching the arc-shaped groove always covers the arc-shaped groove when the profile is adjusted, thereby blocking the airflow in the volute from leaking toward the outside of the end cover through the arc-shaped groove, so as to improve the air tightness of the profile-adjustable fan volute and ensure that the test can be carried out normally.

[0022] After testing and analysis, if it is found that the previous design has deficiencies and a new design scheme needs to be tried, it is only necessary to adjust the fixed position of the adjustment component on the corresponding adjustment groove according to the needs of the new design scheme, so as to achieve the profile adjustment of the volute ring wall. There is no need for engineers to process a completely new volute, which helps to significantly shorten the length of the test cycle, reduce development costs, and avoid affecting the product's time to market; especially in today's increasingly competitive market, the significant shortening of the test cycle and the significant reduction in costs will have a positive impact on the company's market position. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a test fan according to an embodiment of the present application;

[0024] Figure 2 A three-dimensional schematic diagram of a test fan mid-line adjustable fan volute of the above embodiment of the present application is shown;

[0025] Figure 3 An exploded schematic diagram of a fan volute with adjustable profile according to the above embodiment of the present application is shown;

[0026] Figure 4 An enlarged schematic diagram of the middle end cover of the fan volute with adjustable profile in the above embodiment of the present application is shown;

[0027] Figure 5 An enlarged schematic diagram of a sealing gasket in a volute of a fan with adjustable profile according to the above embodiment of the present application is shown;

[0028] Figure 6 A schematic cross-sectional view of a fan volute with adjustable profile according to the above embodiment of the present application is shown, which is cut from the volute ring wall;

[0029] Figure 7 A schematic cross-sectional view of the adjustable profile fan volute of the above embodiment of the present application is shown, cut from the end cover;

[0030] Figure 8 A schematic side view of a fan volute with adjustable profile according to the above embodiment of the present application is shown;

[0031] Fig. 9 A schematic diagram showing the principle of the inner diameter of the slot in the fan volute with adjustable profile in the above embodiment of the present application is shown.

[0032] Explanation of the main component symbols: 1. Fan volute with adjustable profile; 10. Volute frame; 11. End cover; 111. Air inlet; 112. Adjustment slot; 1120. Arc-shaped slot; 113. Protruding shaft; 20. Volute ring wall; 21. Elastic side wall; 210. Reel; 22. Volute tongue; 23. Spring; 30. Adjustment assembly; 31. Adjustment rod; 32. Fixed cover plate; 320. Annular fixing plate; 33. Buffer pad; 34. Magnetic part; 40. Sealing pad; 400. Adjustment hole; 41. Flexible pad body; 42. Flexible flange; 50. Position mark; 60. Angle mark; 2. Fan frame.

[0033] The above main component symbols are combined with the accompanying drawings and specific implementation methods to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] Considering that in the traditional centrifugal fan testing process, whenever the test data reveals design deficiencies and a new design solution needs to be tried, engineers must process a brand new volute, which not only leads to a long waiting time for proofing, but also significantly increases the length of the test cycle, thereby affecting the product's time to market and significantly increasing the development cost of the centrifugal fan. Therefore, the present application provides a fan volute with adjustable profile and a test fan, which can significantly reduce the design iteration time and manufacturing cost.

[0040] Specifically, refer to the attached Figures 1 to 9 As shown, one embodiment of the present application provides a test fan, which may include a fan frame 2, a profile-adjustable fan volute 1 disposed in the fan frame 2, and an impeller (not shown in the figure) rotatably disposed in the profile-adjustable fan volute 1, for performing an optimization test of a centrifugal fan. It is understood that the impeller of the present application may include, but is not limited to, a rotating shaft, a motor drivingly connected to the rotating shaft, and a plurality of blades arranged at intervals along the circumference of the rotating shaft, and the present application will not repeat them here.

[0041] More specifically, if Figures 2 to 9As shown, the adjustable profile fan volute 1 may include a volute frame 10, a volute annular wall 20, and a plurality of adjustment components 30. The volute frame 10 includes a pair of end covers 11 arranged at intervals, each end cover 11 having an air inlet 111 and a plurality of adjustment slots 112 arranged around the air inlet 111. The volute annular wall 20 includes an elastic side wall 21 movably arranged between the two end covers 11 and a volute tongue 22 fixed between the two end covers 11; one end of the elastic side wall 21 is fixedly connected to the two end covers 11 to form an air outlet with the volute tongue 22; the other end of the elastic side wall 21 is rolled up inside the volute tongue 22 to form a reel 210. Each adjustment assembly 30 includes an adjustment rod 31 that is slidably inserted into the adjustment grooves 112 opposite to each other on the two end covers 11 and abuts against the outer wall surface of the elastic side wall 21, and a fixed cover plate 32 that is connected to both ends of the adjustment rod 31 and is respectively located outside the two end covers 11; the fixed cover plate 32 extends outward from the adjustment rod 31 to always cover the adjustment groove 112 when the adjustment rod 31 is adjusted along the adjustment groove 112 to adjust the profile of the volute ring wall 20. It can be understood that the elastic side wall 21 mentioned in the present application can be implemented as a metal coil or a plastic coil, but is not limited to being able to undergo elastic deformation in the radial direction of the air inlet 111, and this application will not elaborate on this.

[0042] It is worth noting that, in the process of testing with the test fan, each adjusting rod 31 can be fixed at the required position on the corresponding adjusting slot 112 according to the profile design requirements; at this time, the impeller rotates to increase the wind pressure in the volute, so that the elastic side wall 21 can better abut against all the adjusting rods 31 under the action of wind pressure, so as to ensure that the actual profile of the volute ring wall 20 is consistent with the designed profile; after testing and analysis, if it is found that the previous design has deficiencies and a new design scheme needs to be tried, it is only necessary to adjust the fixed position of the adjusting rod 31 on the corresponding adjusting slot 112 according to the new design scheme, so as to achieve the profile adjustment of the volute ring wall 20, without the need for engineers to process a new volute, which helps to significantly shorten the duration of the test cycle, reduce development costs, and avoid affecting the time to market of the product; especially in today's increasingly fierce market competition, the significant shortening of the test cycle and the significant reduction in costs will have a positive impact on the company's market position.

[0043] In addition, since the other end of the elastic side wall 21 is rolled up in the volute tongue 22, the circumference of the volute ring wall 20 can be adjusted to meet the needs of different profile design schemes. In other words, when the profile circumference in the profile design scheme becomes shorter, the elastic side wall 21 can be partially rolled up in the volute tongue 22 to shorten the circumference of the volute ring wall 20; when the profile circumference in the profile design scheme becomes longer, the elastic side wall 21 can be partially pulled out from the volute tongue 22 to lengthen the circumference of the volute ring wall 20, greatly increasing the flexibility of adjusting the profile design scheme.

[0044] According to the above embodiments of the present application, Figure 3 and Figure 6 As shown, the volute ring wall 20 may further include a spring spring 23 disposed between the reel 210 and the volute tongue 22, which is used to apply a winding torque to the reel 210, so that the other end of the elastic side wall 21 can be automatically wound in the volute tongue 22 under the action of the spring spring 23, so as to ensure that the elastic side wall 21 is always in an automatically tensioned state. In this way, when the fixed position of the adjustment rod 31 is adjusted to adjust the ring wall profile, if the ring wall circumference increases, the reel 210 will partially stretch under its own elastic action and the action of the wind pressure in the volute to extend the volute tongue 22 and abut against the adjustment rod 31; if the ring wall circumference decreases, the excessively long part of the elastic side wall 21 will automatically roll back the volute tongue 22 under the action of the spring spring 23, and the volute ring wall 20 can still abut against the adjustment rod 31 under its own elastic action and the action of the wind pressure in the volute, thereby realizing the controllable adjustment of the ring wall profile.

[0045] It is worth noting that although the fixed cover plate 32 always covers the adjusting slot 112 when the adjusting rod 31 is adjusted along the adjusting slot 112 to block the airflow in the volute from leaking toward the outside of the end cover 11 through the adjusting slot 112, thereby improving the accuracy of the test results; however, if the adjusting slot 112 extends straight along the radial direction of the air inlet 111 to form a strip slide, and the outer edge of the strip slide is spaced t from the edge of the end cover 11, then due to the restriction of the width M of the fan frame 2, the actual profile of the adjustable profile fan volute 1 is limited to the area of ​​M-2t.

[0046] In addition, since the fixed cover plate 32 needs to cover the adjustment slot 112 under the extreme exposure of the inner and outer sides, and the edge of the end cover 11 is essentially determined by the extreme outer edge of the fixed cover plate 32, the size of the above-mentioned spacing t mainly depends on the length a of the strip slide, that is, the spacing t ≥ ad, where d is the diameter of the adjustment rod 31. Obviously, when the length a of the adjustment slot 112 is larger, the inward adjustable range of the profile of the adjustable profile fan volute 1 is larger, but the actual available space of the adjustable profile fan volute 1 in the fan frame 2 will be smaller. Therefore, in order to take into account both the adjustable range and the available space, such as Figure 3 and Figure 4 As shown, the adjustment groove 112 of the present application is implemented as an arc-shaped groove 1120, so that the outermost adjustable profile of the profile-adjustable fan volute 1 can be shortened compared to the edge spacing of the end cover 11 while ensuring that the adjustment distance / range remains unchanged, thereby improving the space utilization of the profile-adjustable fan volute 1 to the fan frame 2.

[0047] For example, the central angle of the arc-shaped groove 1120 may be between 90° and 360°. Figure 4 and Figure 6 As shown, the central angle of the arc-shaped groove 1120 is equal to 180° to form a semi-circular arc groove.

[0048] Alternatively, if Figure 2 and Figure 8 As shown, the fixed cover plate 32 is implemented as an annular fixing plate 320 arranged concentrically with the arc-shaped groove 1120. In this way, when the adjustment rod 31 moves along the arc-shaped groove 1120 to adjust the annular wall profile, the annular fixing plate 320 can always cover the arc-shaped groove 1120 to achieve a sealing effect; at the same time, since the inward and outward movement range of the adjustment rod 31 and the shielding range of the annular fixing plate 320 are intuitively visible, the curvature radius of the arc-shaped groove 1120 can be determined without tedious calculations. It is understandable that in other examples of the present application, the fixed cover plate 32 can also be implemented as a circular fixing plate arranged concentrically with the arc-shaped groove 1120, and can still always cover the arc-shaped groove 1120, and this application will not repeat it.

[0049] Alternatively, if Figure 3 and Fig. 9 As shown, the adjusting rod 31 is fixedly connected to the annular fixing plate 320, and the adjusting rod 31 is eccentrically arranged relative to the annular fixing plate 320. In this way, when the adjusting rod 31 slides along the arc groove 1120, the annular fixing plate 320 will rotate synchronously so as to always cover the semi-circular groove.

[0050] Alternatively, if Figure 6As shown, both ends of the semicircular arc groove are arranged on the end cover 11 along the radial direction of the air inlet 111, so as to minimize the circumferential offset of the adjustment rod 31 while ensuring the profile adjustment range of the volute ring wall 20, thereby ensuring that there is a small deviation between the volute design intention and the actual adjustment effect, so as to meet the test requirements.

[0051] It is worth noting that although the fixed cover plate 32 always covers the adjustment slot 112 to reduce gas leakage to a certain extent, since the other end of the elastic side wall 21 needs to be rolled up in the volute tongue 22, in order to ensure the flexibility of the overall assembly on the elastic side wall 21 to adjust the position, the actual width of the elastic side wall 21 usually needs to be smaller than the distance between the two end covers 11, which will cause the airflow in the volute to leak from the gap between the elastic side wall 21 and the end cover 11. In order to solve this problem, Figures 2 to 7 As shown, the adjustable profile fan volute 1 of the present application may also include a pair of sealing gaskets 40 respectively located between the two end covers 11 and the volute annular wall 20; each sealing gasket 40 has an adjustment hole 400 corresponding to the adjustment groove 112, so as to fill the gap between the end cover 11 and the volute annular wall 20 while ensuring that the adjustment rod 31 is inserted into the adjustment groove 112 through the adjustment hole 400 to slide along the adjustment groove 112, thereby blocking the airflow in the volute from leaking from the gap between the volute annular wall 20 and the end cover 11.

[0052] Alternatively, if Figure 3 , Figure 5 as well as Figure 6 As shown, each sealing gasket 40 includes a flexible gasket body 41 that provides the adjustment hole 400. The flexible gasket body 41 is protruded from the inner wall surface of the end cover 11 and extends along the elastic side wall 21 to fill the gap between the end cover 11 and the elastic side wall 21, thereby reducing airflow leakage without affecting the movement of the elastic side wall 21, thereby meeting the needs of volute profile adjustment.

[0053] Alternatively, if Figure 3 , Figure 5 as well as Figure 7As shown, the sealing gasket 40 further includes a flexible flange 42 extending along the edge of the adjustment hole 400 and extending from the flexible pad body 41 into the adjustment groove 112, so that the flexible pad body 41 of the sealing gasket 40 can be firmly fixed to the inner wall surface of the end cover 11 through the flexible flange 42 to prevent the flexible pad body 41 from shifting with the movement of the elastic side wall 21. At the same time, the flexible flange 42 can also fill the gap between the adjustment rod 31 and the side wall of the adjustment groove 112, blocking the airflow in the volute from bypassing the adjustment rod 31 through the adjustment groove 112 and leaking toward the inside of the end cover 11, that is, avoiding leakage around the column, further improving the air tightness of the adjustable profile fan volute 1, and ensuring that the test can be carried out normally.

[0054] Optionally, the diameter of the adjusting rod 31 is larger than the width of the adjusting hole 400 and smaller than the width of the adjusting groove 112, so that the flexible flange 42 can be squeezed between the adjusting rod 31 and the side wall of the adjusting groove 112. Not only can the flexible flange 42 better fill the gap between the adjusting rod 31 and the side wall of the adjusting groove 112, but the adjusting rod 31 can also be fixed in the adjusting groove 112 in an adjustable position to a certain extent through the elastic deformation of the flexible flange 42.

[0055] Optionally, the adjusting rod 31 is threadedly connected to the fixed cover plate 32. In this way, when the volute profile needs to be adjusted, the fixing cover plate 32 can be released by rotating it relative to the adjusting rod 31, and then when the adjusting rod 31 is slid to a desired position along the adjusting slot 112, the fixing cover plate 32 can be rotated in the opposite direction to achieve fixing, so that the adjusting rod 31 can be detachably positioned and fixed.

[0056] It is worth noting that since the surface of the adjusting rod 31 is usually an outward convex arc surface, and the surface of the elastic side wall 21 is an outward convex curved surface, if the elastic side wall 21 is in direct contact with the adjusting rod 31, the contact mode is implemented as a line contact, which will cause stress concentration, and it is easy to cause the part of the elastic side wall 21 in contact with the adjusting rod 31 to produce a concave deformation, resulting in a decrease in the smoothness of the volute ring wall profile, which in turn has an adverse effect on the accuracy of the test results. In order to solve this problem, Figure 3 and Figure 6 As shown, the adjustment assembly 30 of the present application may further include a buffer pad 33 fixed to the adjustment rod 31 and in contact with the elastic side wall 21. In this way, the contact area between the adjustment assembly 30 and the elastic side wall 21 can be increased through the flexible deformation of the buffer pad 33, which is convenient for reducing stress concentration and helping to improve the smoothness of the annular wall profile. It is understandable that the buffer pad 33 mentioned in the present application can be made of, but not limited to, a flexible material such as silicone or rubber.

[0057] In addition, when the profile of the annular wall of the adjustable profile fan volute 1 is switched from a small curvature scheme to a large curvature scheme, the elastic side wall 21 tends to maintain its original curvature; at this time, under the condition of a lower power gear, the wind pressure in the volute is small and may not be enough to make the elastic side wall 21 abut against the adjustment component 30, resulting in the annular wall profile not being adjusted in place, affecting the reliability of the test results. In order to solve this problem, as shown in FIG. Figure 6 As shown, the adjustment component 30 of the present application may further include a magnetic member 34 located between the adjustment rod 31 and the buffer pad 33 and magnetically attracting the elastic side wall 21, so that the elastic side wall 21 can be magnetically pulled by the magnetic member 34, so that the elastic side wall 21 can still abut against the buffer pad 33 of the adjustment component 30 under the working condition of low power gear (i.e., the wind pressure in the volute is small), ensuring that the annular wall profile is adjusted in place. It can be understood that although the elastic side wall 21 can always abut against the adjustment component 30 under the magnetic traction of the magnetic member 34, the elastic side wall 21 can still slide relative to the adjustment component 30, and will not hinder the change of the annular wall circumference during the profile adjustment process; at the same time, the magnetic member 34 located outside the elastic side wall 21 will not have an adverse effect on the flow field in the volute, which is conducive to ensuring the reliability of the test results.

[0058] Exemplarily, the elastic side wall 21 can be implemented as a magnetically attractive component, that is, the elastic side wall 21 can be but is not limited to being made of a magnetically attractive material such as iron or an alloy; the magnetic component 34 can be correspondingly implemented as a magnet, so that the magnetic component 34 and the elastic side wall 21 generate a magnetic attraction force, so as to pull the elastic side wall 21 by means of magnetic force.

[0059] Optionally, the lengths of the buffer pad 33 and the magnetic member 34 are both equal to the width of the elastic side wall 21 .

[0060] It is worth noting that in order to make the annular fixing plate 320 always cover the semicircular groove, the annular fixing plate 320 needs to make a circular motion around the center of the semicircular groove, so that the adjustment rod 31 fixedly connected to the annular fixing plate 320 will also rotate synchronously; Figure 6 As shown, in order to ensure that the buffer pad 33 on the adjustment rod 31 can always face the elastic side wall 21 , the buffer pad 33 of the present application can have an annular structure so as to be implemented as an annular pad sleeved outside the adjustment rod 31 .

[0061] Alternatively, if Figure 6 As shown, the magnetic member 34 is implemented as an annular magnet sleeved outside the adjusting rod 31, and the annular pad is located outside the annular magnet, so as to better magnetically attract the elastic side wall 21 to always abut against the annular pad.

[0062] In addition, in order to facilitate the adjustment of the annular fixing plate 320, the annular fixing plate 320 performs a circular motion around the center of the circular arc groove 1120, such as Figure 2 , Figure 4 as well as Figure 8 As shown, the end cover 11 of the present application further has a convex shaft 113 arranged coaxially with the arc-shaped groove 1120, and the annular fixing plate 320 can be rotatably mounted on the convex shaft 113 to facilitate centering rotation with the convex shaft 113 as the rotation axis, thereby ensuring that the annular fixing plate 320 can always cover the arc-shaped groove 1120.

[0063] It is worth noting that, since the annular fixing sheet 320 will block the adjusting rod 31, and the adjusting rod 31 is eccentrically arranged relative to the annular fixing sheet 320, it is difficult to determine the position of the adjusting rod 31 when adjusting the annular wall profile. Figure 8 As shown, the profile-adjustable fan volute 1 of the present application may further include a position mark 50 disposed on the annular fixing plate 320 and corresponding to the adjustment rod 31, which is used to indicate the position of the adjustment rod 31 relative to the annular fixing plate 320, so as to intuitively identify and determine the position of the adjustment rod 31, and facilitate the adjustment of the profile of the annular wall. It is understandable that the position mark 50 mentioned in the present application may be, but is not limited to, implemented as an identification groove opened on the outside of the annular fixing plate 320.

[0064] In addition, in order to further improve the adjustment accuracy of the profile, such as Figure 8 As shown, the profile-adjustable fan volute 1 of the present application may further include an angle mark 60 disposed on the convex shaft 113 and corresponding to the arc-shaped groove 1120, so that the position mark 50 on the annular fixing plate 320 and the angle mark 60 on the convex shaft 113 cooperate with each other to clearly display the sliding angle of the adjustment rod 31 in the semicircular arc groove, thereby completing the adjustment of the profile of the volute ring wall with high precision. It is understandable that the angle mark 60 mentioned in the present application may be implemented as, but not limited to, an angle scale opened on the end face of the convex shaft 113, and its scale compensation may be specified according to the test requirements, and may generally be between 10° and 60°.

[0065] In particular, the angle mark 60 mentioned in the present application can not only be used as an identifier during the fan test process, but also can be used to obtain the coordinates of the actual volute profile control points for drawing design after determining the volute with good air performance. It can be understood that since the convex shaft 113 on the end cover 11 is coaxially arranged with the semicircular arc groove, the coordinates of the center of the convex shaft 113 relative to the center of the air inlet 111 are known. Therefore, if you want to know the coordinates of the actual control point, you only need to calculate the relative coordinates between the control point and the center of the convex shaft 113.

[0066] For example, Fig. 9 As shown, taking the center O of the convex shaft 113 as the origin, the coordinates (Xk, Yk) of the profile control point of the volute ring wall 20 satisfy the following relationship:

[0067]

[0068] μ=α-β-γ

[0069]

[0070] Where: R is the inner diameter of the slot of the semicircular arc slot; r is the radius of the adjustment component 30; α is the angle between the center line of the convex shaft 113 and the air inlet and the Y axis; β is the angle between the position mark and the outermost limit scale of the angle mark. It can be understood that the inner diameter of the slot mentioned in this application depends on the design adjustment range of the semicircular arc slot, usually between 5mm and 100mm, and is considered known in this application; the radius r mentioned in this application refers to the sum of the radii of each component in the adjustment component 30, that is, r=a+b+c, where a is the radius of the adjustment rod 31; b is the wall thickness of the magnetic part 34; c is the wall thickness of the buffer pad 33; usually the radius r is between 3mm and 20mm, and is considered known in this application; the angle α mentioned in this application depends on the position of the convex shaft 113; the angle β mentioned in this application is an adjustable parameter of the test volute, and the control point coordinates can be calculated based on the read angle parameters in this application.

[0071] In summary, the present application can calculate the coordinates of the control point relative to the center of the convex shaft 113 through the above-mentioned relationship, and then easily obtain the coordinates of the control point relative to the center of the air inlet 111; thereby, the angle β that can be directly read on the test volute can be converted into the coordinates required for drawing, thereby realizing the drawing of the volute drawing.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. The fan volute with adjustable profile is characterized by: include: The volute frame comprises a pair of end covers arranged at intervals, each of the end covers having an air inlet and a plurality of arc-shaped grooves arranged at intervals around the air inlet; The volute ring wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; one end of the elastic side wall is fixedly connected to the two end covers to form an air outlet with the volute tongue; the other end of the elastic side wall is rolled up inside the volute tongue to form a reel; as well as Multiple adjustment components, each of which includes an adjustment rod that is slidably inserted into the arc-shaped grooves opposite to each other on the two end covers and abuts against the outer wall surface of the elastic side wall, and a fixed cover plate that is connected to both ends of the adjustment rod and is respectively located on the outside of the two end covers; the fixed cover plate extends outward from the adjustment rod to always cover the arc-shaped groove when the adjustment rod is adjusted along the arc-shaped groove.

2. The adjustable profile fan volute according to claim 1, characterized in that: The central angle of the arc-shaped groove is equal to 180° to form a semi-circular arc groove.

3. The adjustable profile fan volute according to claim 2, characterized in that: Both ends of the semicircular arc groove are arranged on the end cover along the radial direction of the air inlet.

4. The fan volute with adjustable profile according to any one of claims 1 to 3, characterized in that: The fixed cover plate is an annular fixing plate matching the arc-shaped groove.

5. The adjustable profile fan volute according to claim 4, characterized in that: The adjusting rod is fixedly connected to the annular fixing plate, and the adjusting rod is eccentrically arranged relative to the annular fixing plate.

6. The adjustable profile fan volute according to claim 5, characterized in that: The end cover further has a convex shaft coaxially arranged with the arc-shaped groove, and the annular fixing plate is rotatably mounted on the convex shaft.

7. The adjustable profile fan volute according to claim 6, characterized in that: It further includes a position mark which is arranged on the annular fixing plate and corresponds to the adjusting rod, and an angle mark which is arranged on the convex shaft and corresponds to the arc-shaped groove.

8. The fan volute with adjustable profile according to any one of claims 1 to 3, characterized in that: It also includes a pair of sealing gaskets respectively located between the two end covers and the volute annular wall, each of the sealing gaskets has an adjustment hole corresponding to the circular arc groove one by one; the sealing gasket includes a flexible pad body protruding from the inner wall surface of the end cover and extending along the elastic side wall, and a flexible flange extending along the edge of the adjustment hole and extending from the flexible pad body into the circular arc groove.

9. The fan volute with adjustable profile according to any one of claims 1 to 3, characterized in that: The adjustment component further includes a buffer pad which is sleeved on the adjustment rod and fits with the elastic side wall, and a magnetic member which is sleeved between the adjustment rod and the buffer pad and magnetically attracts the elastic side wall.

10. A test fan, characterized in that: include: Wind rack; The fan volute with adjustable profile as claimed in any one of claims 1 to 9, wherein the fan volute with adjustable profile is arranged in the fan frame; as well as An impeller is rotatably arranged on the profile-adjustable fan volute.

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